Just a little bit of personal experience. My little pastel had mites (hoping they've gone as I had a thorough examination of her and I've treated the enclosure twice) and this made her go off food as they can cause stress. I know that this isn't why she stopped eating for you in the beginning but just so you know (if you didn't already) that they can become agitated and go off food during the time they have them

I think the wait after regurgitation is 2 weeks to allow the stomach acid to calm back down so as not to risk another regurg(?) Please feel free to correct me if I'm wrong anyone.